Dielectric properties of lanthanum oxide nanoparticle synthesized using chemical co-precipitation method

Abstract

Lanthanum Oxide nanoparticle is prepared using chemical co-precipitation method in which organic (EDTA- Ethylene diamene tetra acetic acid) as well as biological (STARCH & DNA-Deoxy ribonucleic acid) capping agents are used. The obtained carbonate is thus annealed at 450°C and 700°C to form Lanthanum Oxide nanoparticle accordingly with the Thermo Gravimetric Analysis (TGA). The grain size of the sample is determined using X-ray Diffraction (XRD) analysis and the crystallographic phase is also identified by comparing this pattern with JCPDS data. The morphology of the samples is characterized by Scanning Electron Microscopic (SEM) analysis. The dielectric property and ac conductivity of the samples are studied for the two temperatures. The dielectric permittivity of each sample is evaluated using the observed values of capacitance for a range of frequencies. From the analysis, it is clear that the dielectric permittivity has high values at low frequencies and vice versa. The ac conductivity is also varies with the range of frequencies in such a way that at high frequencies maximum conductivity is possessed. This behaviour of nanoparticles is observed due to the different types of polarization acquired by the samples.